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Credit
Schmerzlose Operationen : oertliche Betäubung mit indifferenten Flüssigkeiten Psychophysik des natürlichen und künstlichen Schlafes / von C.L. Schleich. Public Domain Mark. Source: Wellcome Collection.
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This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.